Architecture & Design Patterns

Component-Based Architecture

The application follows Angular's component-based architecture where each feature is encapsulated in its own component with clear responsibilities.

Modular Design

• Feature Modules: Components are organized by feature
• Shared Module: Common components, pipes, and directives
• Core Module: Singleton services and app-wide functionality

Design Patterns Used

1. Dependency Injection

Services are injected into components via Angular's DI system:

constructor(
  private apiService: ApiService,
  private router: Router
) {}

2. Observer Pattern (RxJS)

Used extensively for handling asynchronous data:

this.apiService.getProducts().subscribe(
  data => this.products = data,
  error => this.handleError(error)
);

3. Guard Pattern

Route guards protect authenticated routes:

{ path: 'cart', canActivate: [AuthGuard], component: CartComponent }

4. Interceptor Pattern

HTTP interceptors handle cross-cutting concerns:

• Authentication token injection
• Error handling
• Loading states

5. Service Locator Pattern

Services are registered at the root level and accessed via DI:

@Injectable({ providedIn: 'root' })
export class ApiService { }